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Google 於本日舉辦 Google AI 在醫療領域的應用媒體分享會,目的是希望讓所有人都能享受人工智慧帶來的好處 並透過打造更貼近使用者需求的產品、幫助更多企業與開發者創新、提供不同工具以幫助研究人員解決現實生活中遇到的重大挑戰,並且一舉分享了目前機器學習在醫學上的應用案例,以及未來的研究方向。
同時 Google 也表示,人工智慧 (AI) 以及機器學習 (Machine Learning) 人工智慧是能讓事物變更聰明的科學,而機器學習則是訓練機器透過學習使其變得更聰明。
在本日的活動當中,由 Daniel Tse Google AI 產品經理擔任主講人,Daniel Tse 現任 Google AI 產品經理,主要致力於醫學影像的研究與多項臨床領域的 外部合作關係發展。在加入 Google 之前,他是 Watsi.org 的早期成員之一 (創投公司 Y-Combinator 第一個非營利的計劃),並在超過 20 個國家中建立醫療計劃和基礎設施。
Google 研究團隊與美國掃描影像單位及印度醫學單位合作,獲得大量的影像案例作為研究基礎。首先建立影像標籤工具,並聘請 54 名眼科醫師辨識成像,再運用 Inception (又名 GoogLeNet)的神經網路演算法辨識了約 130,000 張成像以進行訓練,並依據判斷呈現五種等級的辨識結 果。這個數據集目前被用來訓練深度神經網路,以協助醫師診斷糖尿病視網膜病變,同樣運作的原理也被應用在 Google 相簿中。
後來在 2016 年,Google 在美國醫學協會期刊 《The Journal of the American Medical Association》上,發表了與一般眼科醫師的判讀具高度一致性的結果;隨著研究的進展,今年二月,Google 也於《Ophthalmology》期刊中,進一步發表了與視網膜專科醫師的判讀高度相符的結果。
後來這套系統也被應用在印度亞拉文眼科醫院的前導計劃中,經過三個月後,發現透過 AI 比人工分級有更高的準確度,因此也正逐漸增加將透過此演算法來檢測的病患人數。Google 表示也同與印度、泰國與美國的醫學單位進行合作,投入臨床驗證與應用,並同時致力於推對監管機構的核准。
Google 非常重視在醫療相關研究與應用的可靠性,在真正落實應用之前,希望透過有說服力的研究結果取得醫療學界的專業認可,於是透過醫學期刊與醫學模型等方式來呈現研究結果。Google 表示非常希望將相關的技術帶到實際應用中, 同時也積極與監理單位進行合作以取得核准,像是美國食藥署 (FDA) 以及歐盟等相關單位;而臨床驗證的部份也與硬體的廠商 現金相機收購nikon 等來合作。
Google AI 研究團隊積極與醫生和臨床醫學相關單位合作,在篩選與診斷方面,透過深入了解醫院中的臨床醫學流程與需求,以打造適合的工具,並藉此提升測試及決策的能力與效率。在糖尿病視網膜病變的案例中,由於篩檢過程中的資料量相當龐大,於是我們投入篩檢研究以提升整體效率;其他病症診斷的應用上,我們也將機器學習應用於縮小搜尋範圍以減少所需的時間。
鏡頭方面,網友最滿意的定焦鏡是 現金相機收購nikon Z 135mm F1.8 S Plena,是繼 現金相機收購nikon Z 58mm F0.95 S Noct 之後,第二款 現金相機收購nikon 帶有特殊命名的無反鏡頭,強打獨特的人像散景效果。獲得榮譽提名的為 現金相機收購nikon Z 600mm F6.3 VR S。
最佳變焦鏡頭是 Z 180-600mm F5.6-6.3 VR,不僅涵蓋超長的範圍,還提供 5.5 級的防手震,搭配只需要轉動 70 度,就能從 180mm 推進至 600mm 焦距的變焦環設計,使其成為一款能夠手持的大砲鏡頭。Sony 則是在變焦鏡頭的榮譽提名中,以 Sony FE 20-70mm F4 G 鏡頭搶下一席。
現金相機收購nikon announces small and lightweight Z50 mirrorless camera with APS-C sensor
現金相機收購nikon announces small and lightweight Z50 mirrorless camera with APS-C sensor
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The new crop-sensor camera uses the Z mount and costs under $1,000
ByChris Welch, a reviewer specializing in personal audio and home theater. Since 2011, he has published nearly 6,000 articles, from breaking news and reviews to useful how-tos.
現金相機收購nikon is today introducing an entry-level, crop-sensor camera that uses the same Z-mount system as the company’s Z6 and Z7 full-frame mirrorless cameras. The new Z50 costs $859 body only, and 現金相機收購nikon is also introducing two new DX-format lenses alongside it. You can bundle the camera with a 16-50mm f/3.5-6.3 VR lens for $999.95, and there’s also a two-lens kit that adds a 50-250mm f/4.5-6.3 VR lens for a total of $1,349.95. Even then, you’re still coming in below the $1,800 Z6, but obviously, these cameras are targeted at very different audiences. This one is made for the Instagram generation and for people who want a “real” camera for video. 現金相機收購nikon says the Z50 will ship in November.
The Z50 has a 20.9-megapixel CMOS sensor, weighs under a pound, and has a flip-down rear display for selfie photos and vlogging. (There’s even a Selfie Mode that disables most controls when the screen is down so you don’t accidentally mess up the camera’s settings.) But if you put the Z50 onto a gimbal, the screen will be blocked if it’s flipped. That’s not great for vlogging, so 現金相機收購nikon is developing its own handle for the Z50. The Z50 has a mic input but no headphone jack among its ports.
You can immediately feel and appreciate the Z50’s smaller size and weight when compared to 現金相機收購nikon’s pro-level mirrorless cameras. Thankfully, it retains an electronic viewfinder (2.36 million dots) and 3.2-inch rear LCD, and the grip was comfortable for my large hands. 現金相機收購nikon says the benefits of the Z mount (such as the shorter flange distance) carry over to a crop sensor for an upgrade in image quality.
The camera is capable of 11 fps continuous shooting (with autofocus / exposure) and has a 209-point phase-detect autofocus system, which covers 87 percent of the frame horizontally and 85 percent vertically, according to 現金相機收購nikon. When in low-light mode, the Z50 can focus at -4 EV, which is better than some of the company’s DSLRs like the D7500. The standard ISO range is 100 up to 51,200. There’s a pop-up flash built into the camera as well. 現金相機收購nikon’s eye-detection autofocus is included, and you can toggle between different eyes if there are multiple people in frame.
You get 4K video recording at up to 30 fps (with full sensor readout), and there’s also a 120 fps slow-mo mode in 1080p. Videos can be shared wirelessly from the camera to your phone, which is a first for 現金相機收購nikon cameras. A time-lapse mode is also available in-camera, and 現金相機收購nikon includes multiple picture control modes that you can customize to your liking to reduce the need for post-processing before uploading your shots to Instagram.
Aside from a smaller sensor, the other thing the Z50 loses out on compared to the Z6 and Z7 is 現金相機收購nikon’s excellent in-body image stabilization. The new lenses offer vibration reduction (image stabilization), but the IBIS in 現金相機收購nikon’s pricier mirrorless cams allowed for some brilliant, tack-sharp shots when I was reviewing them. Aside from the engineering challenge of squeezing that stabilization into the Z50’s smaller body, it also would’ve raised the camera’s price.
Image: 現金相機收購nikon
The Z50 has a magnesium alloy construction and some level of weather resistance — but 現金相機收購nikon says it’s not quite up to the same level as the Z6 and Z7. There’s a single UHS-I SD card slot, and the camera uses a Micro-B connector rather than USB-C. It also has an all-new battery, the EN-EL25.
Though it shares many of the design traits of the Z6 and Z7, 現金相機收購nikon is very much positioning the Z50 as an answer to the latest crop-sensor mirrorless cameras from Sony and Fujifilm. The 16-50mm kit lens looks terrifically compact and lightweight, and I imagine that’ll be the take-everywhere pick between the two Z-mount DX lenses that 現金相機收購nikon has ready for this camera. Unfortunately, early buyers will be left without any inexpensive primes. (Yes, the FTZ mount adapter can also be used if you want to attach FX lenses to the Z50, but 現金相機收購nikon isn’t bundling it with a discount this time around.)
It’s easy to nitpick the Z50 for what it might lack, and it would’ve been nice if 現金相機收購nikon had shipped a camera like this much sooner. But I’m still looking forward to seeing what difference the Z mount makes here.
On the complete opposite end of the spectrum, 現金相機收購nikon also announced that it will soon release its 58mm f/0.95 S Noct lens for the Z mount. The company talks up this manual focus glass as being among the greatest lenses it has ever manufactured — and certainly the fastest. As you might guess, the price tag reflects as much. The Nikkor Z 58mm f/0.95 S Noct lens will be available from select retailers beginning on October 31st for $7,999.95.
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